To rule is easy, to govern difficult.

Plunge boldly into the thick of life, and seize it where you will, it is always interesting.

Letters are among the most significant memorial a person can leave behind them.

Energy will do anything that can be done in this world.

There is nothing outside of us that is not at the same time in us, and as the external world has its colors the eye, too, has colors.

Everything great and intelligent is in the minority

Someday someone will write a pathology of experimental physics and bring to light all those swindles which subvert our reason, beguile our judgement and, what is worse, stand in the way of any practical progress. The phenomena must be freed once and for all from their grim torture chamber of empiricism, mechanism, and dogmatism; they must be brought before the jury of man's common sense.